No feedback when an API error occurs editing user

[Steve-Mcl]

Current Behavior

Server-side validation errors are not shown to admin user

Demo show where an attempt to change the name of user test5 to user4 - note user4 already exists but no error is show.

The same issue is present for API errors

• "Invalid username"
• "email must be unique"
• unknown errors

Expected Behavior

Dialog to remain open and to inform user of issue via the validation text

NOTE: the validation text is already present but is impossible to show since the ff-dialog closes upon confirm regardless of the API call success

Related: FlowFuse/forge-ui-components#48

Steps To Reproduce

with 3 users named admin1 (admin) & user1 user2 (non admin)...

1. login as admin1
2. edit user1
3. set user1 name to user2

dialog is dismissed and no change has occured.

Environment

• FlowForge version: 0.9.0-git
• Node.js version: NA
• npm version: NA
• Platform/OS: All
• Browser: All

[Steve-Mcl]

@knolleary @hardillb as a non admin on staging, I cannot check this - would one of you be kind enough to verify this pls?

[hardillb]

I now see a error text under the username if trying to change it to an existing user.